That's mostly been overcome by now. Retargetable graphics for example let you use a graphics card instead of the built-in chipset, and AHI is an abstraction lay

That's mostly been overcome by now. Retargetable graphics for example let you use a graphics card instead of the built-in chipset, and AHI is an abstraction layer for audio that's not at all tied to any particular hardware. The bigger issue is applications that bypass the hardware abstraction layer or throw away the OS entirely, typically games and quite a few productivity applications. I suggest looking at MorphOS and AROS